CFDEM®coupling - User Forum

Hey everyone !

Initially I ran a pisoFOAM (incompressible, laminar) till 250 iterations and then using mapFields, I mapped the inlet boundary conditions onto my new mesh. Although during mapping the MapFields maps only P,U and U_0.

The CFDEM (v3.8.0-3-gb237264) tutorial I took as reference is "/cfdemSolverPiso/settlingTestMPI".

Hi all,

I have been using the cfdemSolverPisoScalar solver for my simulations of packed bed heat transfer, and I have a question concerning the turbulent prandtl number (Prt) when it is set in the ./CFD/constant/transportProperties file.

I have found in literature that Prt is typically between 0.7 and 0.9, however in the /cfdemSolverPisoScalar/packedBedTemp example case, it has Prt = 1e15. This is more than just a small difference obviously.

Hi all,

I have successfully simulated a few CFD-DEM coupling cases with fixed fluid boundaries. Recently, I am very insterested in how to set up a movable boundary of CFD part. For example, during the derformation of DEM particles, I also want to make the fluid boundaries change with the DEM boundaries. When I use Gmsh to generate the CFD boundaries, I found it cannot be changed during the simulations. Could anyone please share me any clues? Thanks ahead!

Best,
Rachel

Hi everyone,
I am working on a problem by CFDEM coupling, I have done the tutorial with the cylinder and chute everything was fine, but I wanted to have a box or a cube instead of the cylinder, so I had to change my blockMesh dictionary, But I knew that I also need to change some boundary conditions for all the properties on zero folder and this gave me some errors after I changed them.

Hi all,

I want to turn off the parallel function in my CFDEM coupling case. I have set:

1. change the processor number to 1 in liggghts input file;
2. change the parCFDDEMrun.sh: nrProcs="10" -----> "1";
3. in folder CFD/system/decomposeParDict: change numberofSubdomains to 1.

When I use "./Allrun.sh" to execute the case, it reports "trying to run parallel using 1 processor" and stopped. So the question is how to turn off the parallel function in CFD-DEM coupling computation?

Many thanks!
Rachel

Hi,

In in.liggghts_run for cfdemPisoSoverSTM there is
fix specCap all property/global speciesCCapacity peratomtype 1
what is speciesCCapacity in here? What is it's phisical significance?
I will really appreciate any answer.
Thanks

In in.liggghts_run for cfdemPisoSoverSTM there is
fix specCap all property/global speciesCCapacity peratomtype 1
what is speciesCCapacity in here? What is it's phisical significance?
I will really appreciate any answer.
Thanks

Dear Users,

Writing a description of the equations of CFDEM coupling, I noticed that the viscous force is included on DEM side as

-div(tau)*Vp

I did not understand why the minus (-) sign was included, considering that the forces in the particle equation are on the right side. Please, can anyone help with this question?
Best regards,

Carlos

Hi,

I am installing CFDEMcoupling on a cluster. OpenFOAM and LIGGGHTS were compiled in separately and they worked beautifully. However, when I input the command 'cfdemCompCFDEMsol', it shows errors like:

/opt/apps/gcc/6.3.0/lib/gcc/x86_64-pc-linux-gnu/6.3.0/../../../../x86_64-pc-linux-gnu/bin/ld: skipping incompatible /lib/libgcc_s.so.1 when searching for libgcc_s.so.1
/opt/apps/gcc/6.3.0/lib/gcc/x86_64-pc-linux-gnu/6.3.0/../../../../x86_64-pc-linux-gnu/bin/ld: skipping incompatible /lib/libgcc_s.so.1 when searching for libgcc_s.so.1